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How to install a Master Disconnect Relocation Battery Switch on your Mustang

Installation Time

3 hours

Shop Parts in this Guide

Installation

Installation

MOUNTING

1. Determine the mounting location for the switch following your sanctioning guidelines.

2. Drill a 25/32” hole through the panel you are mounting through to accept the switch-mounting stem.

3. Remove the switch handle loosing the screw in the center. Remove the first nut and lock washer. Pass the switch through the hole in the panel and secure in place using the lockwasher and nut. Re-attach the switch handle.

4. Apply the ON/OFF Label.

WIRING

1. Disconnect the positive and negative battery terminal. Make sure the switch in the off position.

2. Connect a battery cable from the starter or starter solenoid to one of the 1/2” switch terminals. The battery cable should be a minimum of 2-gauge wire.

3. Connect a jumper wire from the alternator output terminal to one of the 3/16” terminals. Use a minimum of 10-gauge wire for this connector (maximum current 20 amps).

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I've loved Mustangs for as long as I can remember. My dad was a Camaro guy growing up, but his first work truck was a Ford, and we've been a Ford-only family ever since. My dad is a sheet metal worker/mechanic, so everything I know about my car I learned from my dad. Or at least every part that has ...